3A, 18V, 1.4MHz ACOT® Synchronous Step-Down Converter


Update Alert Share

The RT6224D is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 3A output current from a 4.3V to 18V input supply. The RT6224D adopts ACOT® architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under-voltage protection, output over-voltage protection, and thermal shutdown.


  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV
Key Spec.
Status Active
Vin (min) (V) 4.3
Vin (max) (V) 18
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 3.9
Freq (typ) (kHz) 1400
Ext Sync No
Ron_HS (typ) (mOhm) 90
Ron_LS (typ) (mOhm) 45
Iq (typ) (mA) 0.5
Features ACOT Control;Force PWM;OCP;UVP
Package Type TSOT-26(FC)
  • Small Output Voltage at Light Load
  • High-Side Over-Current Limit
  • Integrated 90mΩ/45mΩ MOSFETs
  • 4.3V to 18V Supply Voltage Range
  • 1.4MHz Switching Frequency
  • ACOTTM Control
  • 0.6V ±1.5% Voltage Reference
  • Monotonic Start-Up into Pre-Biased Outputs
TitleLast UpdateShareDownload
3A, 18V, 1.4MHz ACOT® Synchronous Step-Down Converter2016/07/06
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1378
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6224DHGJ6FTSOT-26(FC)3000 Not available Buy from Distributor